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# A 1.5 Kg car moving on a flat , horizontal road negotiates a curve. If the radius of the curve is 35 m and the coefficient of static friction between the tires and dry pavement is 0.5, find the maximum speed the car can have and still make the turn successfully.

$\begin{array}{1 1} 12.2\;m/s \\ 3.5\;m/s \\ 4.8\;m/s\\ 13.1\;m/s\end{array}$

$f_s =m \large\frac{v^2}{r}$
$v_{max} =\sqrt { \large\frac{f_{s, max}r}{m}}$
$\qquad= \sqrt {\large\frac{\mu_s m gr}{m}}$
$\qquad =\sqrt {\mu_s gr}$
$\qquad=\sqrt { (0.500)(9.80\;m/s^2)(35.0)}$
$\qquad= 13.1 \;m/s$